Generally speaking, this means that initially parallel light rays eventually cross or diverge.
2.
With negative birefringence, the crystals appear yellow in parallel light and blue with perpendicular light.
3.
The parabolic mirror reflects parallel light rays entering the telescope to its focus, which is also the focus of the hyperbolic mirror.
4.
Or will a light source made up of many parallel light emitters never be equal to a single ( incandescent ) light source of x lumen?
5.
In general, two types of lenses exist : convex lenses, which cause parallel light rays to converge, and concave lenses, which cause parallel light rays to diverge.
6.
In general, two types of lenses exist : convex lenses, which cause parallel light rays to converge, and concave lenses, which cause parallel light rays to diverge.
7.
These crystals are rod-shaped or rhomboids varying in length from 2 to 20 �m and with positive birefringence ( blue with parallel light, yellow with perpendicular light ).
8.
In order to optimize the telecentric effect, these lenses are often used in conjunction with telecentric ( or " collimated " ) illuminators, which produce a parallel light flow, often from LED sources.
9.
A concave mirror which is a small segment of a sphere behaves approximately like a parabolic mirror, focusing parallel light to a point which is midway between the centre and the surface of the sphere.
10.
We end up with very bright light trapped between the two mirrors; light made of parallel light rays, as if the light was coming from a tiny bright star buried miles deep inside the infinite tunnel.
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